diff --git a/src/arbitrary.rs b/src/arbitrary.rs
index 00380a2..d9d9050 100644
--- a/src/arbitrary.rs
+++ b/src/arbitrary.rs
@@ -868,7 +868,7 @@ impl Arbitrary for RangeFull {
 
 impl Arbitrary for Duration {
     fn arbitrary<G: Gen>(gen: &mut G) -> Self {
-        let seconds = u64::arbitrary(gen);
+        let seconds = u64::arbitrary(gen) % (gen.size() as u64) ;
         let nanoseconds = u32::arbitrary(gen) % 1_000_000;
         Duration::new(seconds, nanoseconds)
     }